"Network Change Detected" - again and again

This has been happening for roughly the past two weeks. As far as I know, I have done nothing to change my configuration.

Situation: I'm online via my Airport connection at home and at some point either a web page won't load or my email tells me it is having problems getting to the server. The 'bars' in my menubar show that I still have a connection and a signal.

When I run the Network Diagnostics that Safari offers it comes to a point where it gives me the message "Network Change Detected: Your network configuration has changed. Click OK to proceed to the next step."

When I do that, and Continue (without changing anything that the dialog is showing me) it then completes and tells me my connection is fine, which it then is. And I can go online, retrieve/send email, etc. ... until the next time (sometimes a day, sometimes a few hours).

However, I have not done anything to change my Network. In fact, I have my Preferences 'locked' (ever since that problem with the 'looping' by the Network preferences, several months back).

Since I now know how to get things back working it's only a bother. But I am left wondering if there is something more dire that this signals. Any ideas?

I am trying to spot some sort of correlation. E.g., I am watching a couple of apps. that go online 'behind the scenes' -- specifically, EyeTV (for the EPG updates) and/or RadioShift (which records radio shows I've subscribed to). The latter only runs over the weekend, so that's not a good candidate since the problem happens at random during the week, not just on Monday (or on the weekend).

Looking back at your first reply I see a few other distinctions -- I never lose my 'bars' and I always show that I am connected to my network. On the few occasions when my signal strength drops and I lose the connection I do find my home-network listed and all I have to do is join it -- it remembers all the name/password settings, just as I'd expect it to.

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